If P_1 : bar r * bar(n_1) -d_1 = 0, P_2 : bar r * bar(n_2) d_2 = 0 and P_3 : bar r * bar(n_3) -d_3 = 0 are three pla

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Q 2641478323.     If P_1 : bar r * bar(n_1) -d_1 = 0, P_2 : bar r * bar(n_2) d_2 = 0 and P_3 : bar r * bar(n_3) -d_3 = 0 are three planes and n_1 , n_2 three non-coplanar vectors then, the three lines P_1 = 0, P_2 = 0; P_2 = 0, P_3 = 0 and P_3 = 0, P_1 =0  are
A

parallel lines

B

coplanar lines

C

coincident lines

D

concurrent lines

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